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A homologous seriesPb2n+1Nb2n−1O7n−1studied by electron microscopy

Published online by Cambridge University Press:  15 July 1999

Ch. Leroux ,
T. Badeche ,
G. Nihoul ,
O. Richard  and
G. van Tendeloo
Ch. Leroux*
Affiliation:
Laboratoire Matériaux Multiphasés et Interfaces, Université de Toulon-Var, B.P. 132, 83957 La Garde Cedex, France
T. Badeche
Affiliation:
Laboratoire Matériaux Multiphasés et Interfaces, Université de Toulon-Var, B.P. 132, 83957 La Garde Cedex, France
G. Nihoul
Affiliation:
Laboratoire Matériaux Multiphasés et Interfaces, Université de Toulon-Var, B.P. 132, 83957 La Garde Cedex, France
O. Richard
Affiliation:
EMAT, University of Antwerp (RUCA), Groenenborgerlaan 171, 2020 Antwerpen, Belgium
G. van Tendeloo
Affiliation:
EMAT, University of Antwerp (RUCA), Groenenborgerlaan 171, 2020 Antwerpen, Belgium
*
[email protected]
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Abstract

The PbO–Nb2O5 phase diagram has been investigated, using electron diffractionand high resolution electron microscopy (HREM), for [Pb]/[Nb] ratios between 1 and1.25. Apart from the basic pyrochlore structure, different long periodsuperstructures, forming a homologous series Pb2n+1Nb2n−1O7n−1 based onthe pyrochlore structure have been found. Members with n = 5, 7, 9, 11 have beenobserved and their structure determined based on electron diffraction and HREM. Imagesimulations allow studying the influence of cation and oxygen vacancies in the basicstructure. Ordering of oxygen vacancies could be detected while no cation vacanciesare observed. Deviations from the perfect structure and ordered stacking defects arediscussed.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 7 , Issue 1 , July 1999 , pp. 33 - 40
Copyright
© EDP Sciences, 1999

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